Every month Accor offers an opportunity to earn 4x points for stays at their newly launched properties. It's a great way to try a new hotel (new rooms, new services and staff eager to ensure the best experience) and earn bonus points in the process. You can use this offer as many times as you want.
Don't forget to register for the offer here before booking your stay.
Since the participating hotels in this offer change every month, it's treated as a new offer. That means, probably you should register every time for this offer. To be on the safer side, just register for it before you make a booking at any of the new hotels.
To see the current list of participating hotels, see the offer page.